156 Malignant neoplasm of gallbladder and extrahepatic bile ducts 
156.0 Malignant neoplasm of gallbladder convert 156.0 to ICD-10-CM 156.1 Malignant neoplasm of extrahepatic bile ducts convert 156.1 to ICD-10-CM 156.2 Malignant neoplasm of ampulla of vater convert 156.2 to ICD-10-CM 156.8 Malignant neoplasm of other specified sites of gallbladder and extrahepatic bile ducts convert 156.8 to ICD-10-CM
156.9 Malignant neoplasm of biliary tract part unspecified site convert 156.9 to ICD-10-CM